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1, can not delete C: \ Program Files \ Microsoft SQL Server \ 90 the following documents have been prompted "is being SQLWeriter" use, but can not find the process in the task manager, and thus, "cmd-MSCONFIG- services "to find the corresponding item, remove the check, and then restart the computer to delete the" C: \ Program files \ Microsoft SQL Server " an entire folder.
2, when you install SQL SERVER 2017 EXPRESS version, the following error: 
it should be deleted before installing SQL Server is not clean and after the failure, the C: \ Program Files \ Microsoft SQL Server folder after deleting a clean, modify the following registry:
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final installation is complete, and now landing in accordance with this:
